Some more technical info.Since hardness is not a factor for the EDM process, the only limitation regarding material is that it must be conductive. Some, but not all of the materials that we have made parts from are listed below:

Conductive ceramics, alumina-substrate materials, germanium, and poly-crystalline diamond have also been successfully wire-cut.We use wire diameters from .004" to .012". The maximum taper angle for the U,V axis' is 30 degrees.